Perhaps you should try some spelling variations:
trong van » trong cac
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
tang van » dang van, hoang van, tang luan
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (so sanh)) thu ((tang van) or (trong van)) hoe. hieu va pham duc va thanh vi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) thu ((tang van) OR (trong van)) hoe. hieu va pham duc va thanh vi cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) thu ((tang van) or (trong van)) hoe. hieu va pham duc va thanh vi cua cu".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) thu ((tang van) or (trong van)) hoe. hieu va pham duc va thanh vi cua cu*.